Submission #229230

#	Time	Username	Problem	Language	Result	Execution time	Memory
229230		VEGAnn	Nivelle (COCI20_nivelle)	C++14	110 / 110	239 ms	11000 KiB

nivelle

#include <bits/stdc++.h>
#define all(x) x.begin(),x.end()
#define PB push_back
using namespace std;
typedef long long ll;
const int N = 100100;
const int M = 1000100;
const int oo = 1e9;
string s;
int n, pf[N][26], ansf, anss, se, fi;

int calc(int l, int r){
    int res = 0;
    
    for (int i = 0; i < 26; i++)
        res += bool(pf[r][i] - pf[l - 1][i]);
    
    return res;
}

bool smaller(ll x, ll y, ll a, ll b){
    return x * b < a * y;
}

int main(){
    
    ios_base::sync_with_stdio(0); cin.tie(0);
    
//    freopen("in.txt","r",stdin);
    
    cin >> n >> s;
    
    for (int i = 1; i <= n; i++){
        for (int j = 0; j < 26; j++)
            pf[i][j] = pf[i - 1][j];
        
        pf[i][s[i - 1] - 'a']++;
    }
    
    ansf = oo; anss = 1;
    fi = se = -1;
    
    for (int kol = 1; kol < 27; kol++){
        int j = 1;
        
        for (int i = 1; i <= n; i++){
        
            while (j <= i && calc(j, i) > kol) 
                j++;
            
            if (calc(j, i) == kol && smaller(kol, i - j + 1, ansf, anss)){
                ansf = kol;
                anss = i - j + 1;
                fi = j;
                se = i;
            }
        }
    }
        
    cout << fi << " " << se;
      
    return 0;
}

• Subtask 1: 7 / 7
• Subtask 2: 17 / 17
• Subtask 3: 13 / 13
• Subtask 4: 25 / 25
• Subtask 5: 48 / 48